Steam-boiler furnace.



G. H. BARRUS.

STEAM BOILER FURNAUE.

APPLIOATION FILED 11110.23, 1900.

Patented Aug. 22, 1911.

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STEAM BOILER FURNAGE.

APPLIOATION FILED 11110211909.

Patented Aug. 22, 1911.

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G. H. BARRUS.

STEAM BOILER FURNAE.

APPLIOATION FILED nno.2a,.19o9.

1,001,336. Patented Aug. 22, 1911.

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UNFFFD STATE@ PATENT FFICF.

GEORGE HALE BARRUS, OF BROOKLINE, MASSACHUSETTS.

STEAM-BOILER FURNACE.

To all whom it may concern.

Be it known that l, Gnonon Hann lannus, a citizen of the United States, residing at Brookline, county of Norfolk, State of Massachusetts, have invented a certain new and useful Improvement in Steam-Boiler Furnaces, of which the following is a specification, reference being hadv therein to the accompanying drawings.

My invention has for its object to provide a steam boiler furnace by the employment of which I may secure a more perfect eom bastion of gaseous coal, as also the prevention of smoke.

My invention is more fully set forth in the following description, taken in connection with thc accompanying drawings, to which reference is made therein and. the novel features thereof are pointed out and clearly defined in the claims at the close of the specification.

Referring to the drawings, Figure l is a side elevation partly in section of a wellknown form of water tube boiler embodying my invention. Fig. 2 is a section on line 2"?. of Fig. l, and showing a pair of boilers set side by side. Fig. 8 is a section on line SMS, Fig. 2. Fig. 4 is an elevation like that shown by Fig. l, but showing a modified form of draft regulation. Fig. 5 is an ele- 'vation like that shown in Fig. l, and showing still another modification of the draft regulation.

My invention may be employed in connection with boilers of any well known construction.

In Figs. l and 2 l have shown a common form of water tube boiler familiar to those skilled in the art and. which it will be unnecessary to describe further than to note that the upper row of water tubes is shown at F, and the lower row at Gr. H the setting of brick or equivalent material. J are the grate bars, the tire chamber being above them, and the ash pit below them, the door opening through which the furnace is fired is shown at 4t, and the ash nit opening at 51. The bridge wall at the rear of the grate is shown at M, and the transverse battle wall across the space above the boiler tubes at N. The space lengthwise of the eater tubes is separated into three portions or passes by the usual batlles shown at O and l).

For the application of my invention two Specification of Letters Patent.

Application led December 23, 1909.

Patented Aue'. 22, 1911.

serial No. 534,639.

boilers or the equi\l'alent thereof are necessary. ',lhese are indicated at 1 and Q, Fig. Q. They are set side by side, and are separated by a division wall lt of any well known construction, which etl'ectually separates each of said boilers from the other. llaeh 'furnace is provided with the usual tire door and ash doors located in the boiler front, as also with the proper flue or uptake and a controlling' damper or dampers therefor.

In Fig. 3 the flue of the boiler, which I have designated l. (in Fig. 2), is marked l, and the tlne of the companion boiler 2 is marked C. The damper in the flue C is indicated at S, and the damper in flue B is designated 5.

ln embodying my invention in a pair of boiler furnaces such as above described, the division wall lt between the two furnaces is cut away to provide an opening therein indicated at A, the said opening being of a size su'fl'icient to permit the gaseous products of combustion on either grate to pass through the same into the ai'ljoining furnace chamber. lVhile it is not essential that this opening A should be of any particular shape, I prefer to make it of the shape shown in Fig. '1. and to have it located with reference to the grate as there shown, that is, the larger part of the opening being' forward of the center of the grate bars and eX- tending downwardly to form an opening A' below 'the level of the grate bars. Grate bars shown at 8, are placed in said opening on a level with the grate bars J and thus a continuous grate is formed extending across both furnaces in the usnal manner and also across the opening .f A in the division wall. This expedient increases the grate surface to thc extent of the thickness of the division wall and contributes to a greater degree of capacity and efficiency `in the furnace.

l contemplate that the two furnaces hercinabove referred to shall be alternately fired. lf this were done without further provision than as above set forth, the boilers, espeeially the rear passes thereof` would be alternately subjected to intense heat` and there would consequently be a reduction in the efficiency of the heating surface. To obviate this, l provide a rearward opening' in the division wall located between the second or third passes of the two boilers, and I provide a damper for use in connection with such rear opening which is located between the front pass of each boiler and such rear opening.

I have shown in the drawings three arrangements of this rear opening and it-s dampers. In Fig. 1, the rear opening in the division wall is shown at IV above the second pass of the boiler, and the auxiliary damper V is employed in connection therewith. The damper V, when closed, extends across the space between or directly above the upper row F of t-ubes and closes the first pass of the boiler. I have shown this damper'V as pivoted at its forward end at 9 so that it may be raised or lowered in opening or closing it. This damper may be operated by any well known mechanical means. By closing this. damper V in the newly fired furnace and leaving the damper V of the other furnace open, the burning gases from the newly fired coal on the grate below are prevented from passing upwardly through the first pass of the boiler of the newly fired furnace and consequently pass through the opening A, over the incandescent coal on the adjoining grate, upwardly through the iirst pass of the boiler, the corresponding damper V being open and are then distributed, part of them passing through the opening VVT and thence through the second and third passes of the boiler which has been newly fired, and part of them passing on through the third pass of the other boiler to its discharge flue, the discharge flues of both said boilers being open. In this way, the second and third passes of both said boilers are continually subjected to heat and the loss of heating surface at those points is reduced to a minimum.

In the modification shown in Fig. 4 the opening A extends down to substantially the level of the grates and the rearward opening in the division wall is shown at 14 below the third pass of the boilers. In front of this opening and just rearwardly Vof the second pass I provide a partition wall 13 which closes the space underneath the boiler tubes in front of the opening 111 and in this partition wall 13 I place a damper 15 whereby the movement of the gas may be controlled. Then the damper 15 is closed the burning gases from the companion boiler furnace pass through the opening 1A and thence upwardly through thev third pass of the boiler to the flue.

In Fig. 5 still another modification of the rearward opening and damper is shown. In said figure the opening in the division wall is shown at K above the third pass of the boilers and rearwardly of the transverse partition wall N. The cooperating damper is shown at L and overlies and closes the third pass of the boiler; said damper being pivoted at 10, and being provided with any suitable well known mechanical means for opening and closing it. In this arrangement the damper L of the boiler of the newly fired furnace is closed, and the corresponding damper L of the companion. furnace is opened, the products of the newly fired coal pass through the opening A, over the incandescent coals in the companion furnace, rearwardly through the passes of the boiler of this furnace and are then distributed to the passes of both boiler furnaces, part of them passing through thc rear opening K.

The operation of a pair of furnaces embodying my invention is as follows: Assuming a bright and level bed of coals of good depth on each grate, the flue dampers of both furnaces being open and the damper in furnace numbered 2 between the rearward opening in the partition wall and the front pass of the boiler being opened, and a charge of coal introduced on the grate of furnace 1. The damper which is thus opened is shown at V, Fig. 1, or if the arrangement shown in Fig. 11 is employed, is shown at 15; or if the arrangement shown in Fig. 5 is employed, is shown at L. The volatile gases given off by the newly fired coal pass horizontally through the opening A in the division wall, over the bed of incandescent coals on the grate of furnace 2. The effect of the heat radiated from these coals upon the gases is to raise their temperat-ure to the ignition point and such of the gases as have not already burned are ignited, and before the cooling surfaces of the boiler tubes are encountered the color of the flame becomes clear white, the smoke disappears and the gas is in a perfect state of combustion. These gases pass rearwardly in furnace numbered 2, through the openingV or damper V, or 15, or L, as the case may be, and are then distributed, part of them passing back again through the division wall R by way of the openings IV, or 14, or K, respectively. By this distribution of hot gases the rearward pass of both boilers are continuously subjected to a high degree of heat. IVhen the volatile gases are all burned off from the grate of furnace 1, which the fireman can readily determine by observation, the damper V, 15, or L, as the case may be, intermediate the rearward opening in the division wall and the top of the first pass, is opened, and the corresponding damper of the companion furnace 2 closed and a charge of coal is fired upon the grate of furnace 2. The process is now reversed, the gaseous products of combustion from the newly fired coal pass through the opening A in the division wall in the opposite direction over the incandescent coals on the grate of furnace 1. `When the gas has all distilled off from the coal on the grate of iturnace f2, the interinediate dampers are again reversed ijn position, the grate ot said turnace being tired and the process repeated.

To .insure that the unburned gases which pass throi'igh the opening A in the division wall shall be subjected lto the 'full e'tl'ect oil Vthe heat from the incandescent coals in the companion turnace, l apply on top oit the lower row ot Water tubes (if, see Fig. 2, a layer 7 oit heat resisting material, such as tire-brick tile to cover the spaces between the tubes of each boiler which are nearest the division wall R. rlhe said layer 7 may extend out from said division wall to cover a greater' or less number ot said tubes. I preter that the said layer should extend out as shown in Fig. 2 to about onethird or slightly more of the distance across the :turnace. rlhe employment of this layer T to till the spaces between the said tubes prevents the gases -from rising at once into the tube space and compels them to talce a longer course over the incandescent coal and eonsequently to remain exposed a longer time to the heatl from said coal. This expedient insures a more perfect combustion ot the gases and reduces to a minimum the gaseous products of eon'ibustion Vwhich escape trom the 'furnace unburned. The opening A in the division wall It may be extended downwardly to torni an opening A below the level of Ythe grate bars. Grate bars, shown at 8, are placed in this opening on a level with the grate bars in the furnace and thus a continuous grate bar is 'tormed, extending across both :turnares in the usual manner, and also across the opening A A in the division wall. This expedient increases the grate surface to the extent oi the thickness ot the division wall and contributes to a greater degree ot capacity and etlicieney in the t'urnace.

What l claim is:

l. A pair of water tube boilers set side by side, each having its own furnace, a division wall between said two boilers having a front and a rear opening therethrough, transverse partition walls dividing each boiler and its setting into vertical passes, a damper between each front pass and said rear opening, the said front opening in the longitlulinal division wall connecting the two 'furnaces and the rear opening connecting passes to the rear of the front passes, whereby the said dampers control the path oit movement of the products ot eomtnistion through the said passes.

2. A. pair o't boilers set side by side, each having its own 'turnace, a longitudinal division wall having a trent tn iening and a rear opening, transverse partition walls dividing the space in the setting into passes, the tront opening in the longitudinal division wall connecting' the two `liront passes and the rear opening in the hingitlulinal division wall connecting passes to the rear ot the 'ti-ont passes, and a battle in each o't said tiilrnaces above the said 'tront opening and extending outwardly from the said division wall whereby the direction ot? the unburned gases which pass through said tront opening is controll e d.

3. A pair o'tE boilers set side by side, each having its own furnace, a longitudinal division wall having a 'liront opening and a rear opening, transverse partition walls dividing the space in the setting into passes, thel rtrout opening in the longitudinal division wall connecting the two trent. passes and the rear opening in the longitudinal division wall connecting passes to the rear oli the ilront passes, and a battle in each ot said 't'urnaees above the said .trent opening and extending outwardly 'from the said division wall whereby the direction o't" the unburnet'l gases which pass through said :front opening is controlled, and a ctintinnous grate :tor both t'urnaces extending through said tront opening in the division wall.

ln testimony whereot l. atlix my signature, in presence oit two witnesses.

GEORGE HALE TARRUS.

Witnesses fuman A. ittnoLnon, Amici-1 H. hloinnsoN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

